Foraging Habits 



375 



larvae there is developed both before and behind its 

 border a considerable array of combs and rakers. In 

 use the head is thrust forward, and these are dragged 

 backward across the surface that supports the growth 

 of diatoms and other algae. 



The principal carnivores of the rapids are the nymphs 



of stoneflies (see fig. 1 1 1 on p. 204) and a few small 



^vertebrates. Among the latter are the insect-eating 



brook salamander. Spelerpes, and a number of small 



fishes, such as darters, dace and minnows. 



